No inn logouts definitely is a must, 2 sessions sounds great too, like you said 1-20 in one session is a lot.

What kind of ruleset is there for the 1-20 run? Does it have to be in one session no logout waiting for hearthstone like for 1-10? Or more like the 1-60 run where u can logout and wait?

Please note the run starts 12 minutes into the video, there's a warmup fail at the start.